Add a FileInfo class which holds all info of a file and return that from getFileInfo, getDirectoryContent and search

The encrypted size was used when calculating folder sizes.
This fix now also sums up the unencrypted size and shows that one when
available.

Storage mount points are not deletable, so make sure that the unlink
operation and its hooks aren't run in such cases.

Note that some storages might recursively delete their contents when
calling unlink on their root. This fix prevents that as well.

Fixes #6526

This is to make sure that method isn't broken

make sure that we don't try to access an already deleted files, fixes some file source not found warnings

Also adjusted all ext storage backends to not override these when the
default behavior is expected.

To find out whether to apply a quota, we now try and detect whether the
storage to wrap is a "Home" storage.

Fixes #4593

Added argument to getFileInfo() to disable adding the size of
mountpoints to a directory's size.

Fixes #5924

Now removing "/./" and trailing "/." from the paths when normalizing.

Legacy home storage ids with the format "local://path/to/datadir/user1"
are now also wrapped by the HomeStorage.

Note that the root folder size is mandatory for quota calculation.

WIN: fixing Fatal error: Call to a member function logicToPhysical() on a non-object in C:\jenkins2\workspace\server-stable5-windows\database\mssql\label\WINDOWS\lib\files\storage\mappedlocal.php on line 311